The Egg Keeper is a floating guard robot that has been assigned to patrol the halls of Dr. Eggman's Final Egg base in Sonic Adventure. They float idly as if asleep, then stir when an intruder approaches. If Sonic tries to attack them head on, they will repel him using their reinforced arms. The Keepers stop intruders in their tracks by detaching their heads, which then float directly over the intruder and hold them in place with a tractor beam. The Keeper will then fire up its jets and ram into the paralyzed enemy. If the intruder struggles enough, it can escape the Keeper's beam and attack the robot as it charges.